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Method of recognizing communication signal modulation mode based on feature extraction

A modulation method and communication signal technology, applied in the field of communication, can solve the problem of signal-to-noise ratio reduction

Active Publication Date: 2014-09-03
GUANGZHOU HAIGE COMM GRP INC
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Problems solved by technology

Theoretically, the M power spectrum of MPSK should have obvious single-frequency components at its M times, but it is mentioned in the literature [7] that after the signal M power, the signal-to-noise ratio will be significantly reduced

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  • Method of recognizing communication signal modulation mode based on feature extraction
  • Method of recognizing communication signal modulation mode based on feature extraction
  • Method of recognizing communication signal modulation mode based on feature extraction

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Embodiment Construction

[0058] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0059] The English abbreviations involved are as follows:

[0060] AM Amplitude Modulation

[0061] FM frequency modulation

[0062] CW single carrier

[0063] ASK amplitude keying

[0064] MFSK M-ary frequency shift keying

[0065] BPSK binary phase shift keying

[0066] QPSK quadrature phase shift keying

[0067] π / 4-QPSK π / 4 phase-shifted QPSK

[0068] OQPSK Offset Quadrature Phase Shift Keying

[0069] MQAM M-ary quadrature amplitude modulation

[0070] A method for identifying a communication signal modulation mode based on feature extraction, comprising the steps in the following sequence:

[0071] 1) First, perform median filtering on the received signal, use the signal obtained by median filtering to estimate the bandwidth, and perform linear filtering o...

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Abstract

The invention discloses a method of recognizing a communication signal modulation mode based on feature extraction. As for received signals, a normalized power spectrum and the number K of spectrum peaks in the case when a constant B is exceeded in the normalized power spectrum are firstly calculated, and the communication signal modulation mode is comprehensively recognized according to the K value, the maximal value gamma<max> of the spectral density of the normalized zero center instantaneous amplitude and a ring feature parameter num. According to the method of the invention, the communication signal modulation mode can be quickly and accurately recognized.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for identifying a communication signal modulation mode based on feature extraction. Background technique [0002] The role of communication signal modulation identification is to analyze, judge and classify the modulation mode of unknown signals and estimate its modulation parameters, which can be widely used in the field of civilian and military spectrum monitoring. The research on modulation recognition has achieved rapid development in the past two decades, and researchers have developed a number of valuable recognition methods. Literature [1-4] analyzed the transmission characteristics of communication signals in the free propagation space, and extracted some characteristic parameters (such as γ max ,δ dp and other parameters), these characteristic parameters have a better recognition effect on the communication signals of satellite communication or short-di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04L27/00
Inventor 熊韬高迎帅郭磊曹云建
Owner GUANGZHOU HAIGE COMM GRP INC
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